Bioefficacy of native Bacillus thuringiensis isolates against cabbage leaf webber, Crocidolomia binotalis Z.

Present investigations were carried out to assess the efficacy of native Bacillus thuringiensis isolates against cabbage leaf webber, Crocidolomia binotalis Z. and their molecular characterization. Of the thirty-five isolates tested against C. binotalis, mortality of each isolate varied. Maharastra isolate M-49 caused a mortality of 80 per cent, Tamil nadu isolate Tx-381 which was bipyramidal in shape recorded 90.00 per cent mortality. Goa isolates 1698/3, 1676/3 and 1711/1 recorded 83.33, 83.33, and 86.67 per cent mortality and Chikkamanglur isolate 2422/C recorded 80 per cent mortality. Molecular characterization of selected isolates represented the presence of lepidopterans specific genes cry1 and cry2.